Update runtime files.
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 162eb9d..80b7e38 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1,4 +1,4 @@
-*usr_41.txt* For Vim version 8.2. Last change: 2022 May 13
+*usr_41.txt* For Vim version 8.2. Last change: 2022 May 21
VIM USER MANUAL - by Bram Moolenaar
@@ -1923,6 +1923,8 @@
If you split your plugin into parts, you can use `import` and `export` to
share items between those parts. See `:export` for the details.
+More information about writing plugins is in |usr_51.txt|.
+
==============================================================================
Next chapter: |usr_42.txt| Add new menus